Cognomen Giustinian (Giustinian 
) , around the globe, is a very rare surname. The cognomen Giustinian is characteristic of Argentina, where it is a very rare surname, Italy, and Venezuela, where it is an extremely rare surname. Much less frequently, Giustinian is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Giustinian | Argentina, United States, Venezuela, Peru, Italy |
| marco giustinian (b. 1220) |
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| marco giustinian (b. 1320) |
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| leonardo giustinian Italian politician and humanist, IT (b. 1388) |
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| orsotto giustinian IT (b. 1394) |
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| bernardo giustinian IT (b. 1408) |
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piero giustinian IT (b. 1490) |
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| sebastian giustinian Venetian diplomat, IT (b. 1460) |
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| pancrazio giustinian (b. 1465) |
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| antonio giustinian (b. 1466) |
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| marcantonio giustinian Italian publisher, typographer and ambassador (1516-1571), IT (b. 1516) |
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| giustiniano giustinian IT (b. 1525) |
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| orsatto giustinian Author of Sonetti alla moglie, IT (b. 1538) |
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| giorgio giustinian (b. 1572) |
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| giovanni giustinian IT (b. 1600) |
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| girolamo giustinian IT (b. 1611) |
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